Image by Flickr user mofetos

Update 3, February 22: The third suspect, Brandon Green, has been arrested in Columbia.

Update 2, February 17: A second suspect, Ledarian Phillips, 20, has been arrested and a third suspect, Brandon Green of Summerville, 20, has been identified. 

Update, February 16: A second suspect has been identified.

First reporting: One of three suspects, DeShawn Heyward, 20, has been arrested for a break-in and assault at a Sumter Street home, a crime that the victim's boyfriend saw the start of on a Skype video call.

I'll point you to ABC News 4's report.